This is why I hate investing in startups raising $500k or less. You won't be able to raise again unless you have significant upwards progress.
Several of my best investments have been from startups raising less than $500k. Justin.tv/Twitch returned 97x my original investment, and Weebly will likely be even more.
I have never get investment (rarely in my country) but always thinking that I prefer a small push than a huge one.